i work in bridgeport. i drove back up here. it was the longest drive of my life, it was really hard not knowing. >> reporter: teachers barricaded the students in classrooms before they could be evacuated. >> children, beautiful, beautiful children who had simply come to school to learn. >> we heard like shots and everybody went on the ground. and ms. martin closed the door and we went to the corner. >> reporter: police and s.w.a.t. teams surrounded the school and stormed outside buildings. >> upon arrival, entered the school and began a complete active shooter search of the building, searching every portion of that school. >> reporter: it's believeded the gunman drove there where he killed his mother, a teacher, and her students. >> shocked, disgust. why would this happen? >> reporter: the magnitude of the loss of life involving so many children has shaken this community and the nation. >> i know there's not a parent in america who doesn't feel the same overwhelming grief that i do. the majority of those who died today were chi